Blocking Mode
CPU is block and waits the task to finish. Straight forward to use but less performance.
若沒有在timeout內發送完成，則不再發送，return HAL_TIMEOUT。
HAL_UART_Transmit(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size, uint32_t Timeout);
HAL_UART_Receive(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size, uint32_t Timeout);Interrupt Mode
CPU is free to do other tasks while waiting for the task to finish. Interrupts will raise when the task is done.
皆收到資料時，會觸發串口中斷函數，直到接收指定長度的資料後，才會停止中斷，接著進入callback函數（回調函數）。
HAL_UART_Transmit_IT(UART_HandleTypeDef *huart, const uint8_t *pData, uint16_t Size);
HAL_UART_Receive_IT(UART_HandleTypeDef *huart, const uint8_t *pData, uint16_t Size);DMA Mode
Direct memory access, the data is transferred between memory without pass the CPU. The best performance and the most complicated setup.
HAL_UART_Transmit_DMA();
HAL_UART_Receive_DMA();